Open source Email marketing

Ghost

98 · Healthy

Publishing platform for blogs and newsletters, with paid memberships, subscriptions and email delivery built in.

Free to useMIT★ 56kLast commit yesterday

Mautic

87 · Healthy

Marketing automation platform with campaigns, segments, landing pages and lead scoring.

GPL-3.0-or-later★ 11kLast commit yesterday

listmonk

83 · Healthy

High-performance newsletter and mailing-list manager shipped as a single binary.

AGPL-3.0★ 24kLast commit 7 days ago

useSend

74 · Stable

Email sending service with an API, SMTP, domain management and campaigns, running on Amazon SES.

AGPL-3.0★ 4.7kLast commit 31 days ago

Posta

71 · Stable

Email delivery service that lets your apps send through an HTTP API, with templates, delivery tracking and analytics.

AGPL-3.0Relicensed 2026★ 521Last commit 6 days ago

Plunk

70 · Stable

Email platform for SaaS products that combines transactional email, campaigns and automations on top of Amazon SES.

AGPL-3.0★ 5.5kLast commit yesterday

Postal

65 · Stable

Mail delivery platform for sending transactional email from your own servers.

Free to useMIT★ 17kLast commit 9 days ago

Keila

64 · Stable

Newsletter tool with a block editor, sign-up forms and campaign stats.

AGPL-3.0★ 2.2kLast commit 8 days ago

Dittofeed

61 · Stable

Customer engagement platform for automated email, SMS and push journeys.

Free to useMIT★ 3.0kLast commit 6 days ago

BillionMail

56 · Caution

Self-hosted mail server and newsletter platform for campaigns, templates and subscriber lists.

AGPL-3.0Relicensed 2025★ 16kLast commit 4 months ago

Mailtrain

15 · At risk

Self-hosted newsletter app built on Node.js.

GPL-3.0★ 5.8kLast commit 3.8 years ago

Source-available and unverified licenses

The code for these is public, but the license is not an OSI open source license, or we have not verified it yet. Check the license notes on each project before relying on it.

Notifuse

68 · Stable

Newsletter, email marketing and transactional email platform with a visual MJML editor and several sending providers.

Free core, paid extrasBusiness Source License 1.1★ 2.2kLast commit 22 days ago

Postal

Mail delivery platform for sending transactional email from your own servers.

GitHub postalserver.io

Alternative to

SendGrid Mailgun Postmark Resend MailerSend

Will it still be around?

Stable

Score 65/100

Details

Can a business use it freely?

Free to use

MIT · open source (permissive)

Details

Flat Rate Deploy

List price checked 8 Oct 2026 · Source · Disclaimer

Bespoke

We set up Postal for you. You pay once.

Worth it from 1,500,000 emails a month

You pay $20 a month for SendGrid. Setup is $3,000, paid once, and after that Postal runs for about $324 a month (your server, about $24, plus about $300 of maintenance), so at this size it takes more than 12 months to pay back.

Worth it from: 1,500,000emails a monthpays back within 12 months
Setup, paid once: $3,000fixed price, agreed up front
Maintenance: $150/houronly when you ask for it

What we do

Data migrationRecords, files and history moved from SendGrid, with a test run before the cut-over
ConfigurationWorkflows, custom fields, roles, permissions and SSO set up for your team
IntegrationsConnected to your CRM, Slack, accounting tools and APIs
MaintenanceUpdates, fixes and admin help when you ask, at $150 an hour
Paid editionsThe vendor's paid features, enabled, with the licence at cost
ComplianceData residency, audit logs, data processing agreements, security questionnaires
TrainingAn admin walkthrough, a runbook and sessions for your team

Total spent, month by monthSendGridBespoke Postal

Show as a table

Month	SendGrid	Bespoke	Saved so far
Today	$0	$3,000	–
Month 3	$60	$3,972	–
Month 6	$120	$4,944	–
Month 9	$180	$5,916	–
Month 12	$239	$6,888	–
Month 18	$359	$8,832	–
Month 24	$479	$10,776	–
Month 30	$599	$12,720	–
Month 36	$718	$14,664	–

Servers run on your own cloud account, paid to your provider. Running cost counts about 2 hours of maintenance a month; you're billed only for hours you ask for. Migration and the other activities are quoted with the setup.

Get a fixed quote

Health score: 65/100

Stable · activity, bus factor and issue responsiveness, from GitHub

Score v2 · How it works

Activity

45% weight

76/100

Last commit 9 days ago (100/100).
18 commits in the past 12 months (56/100).
3 releases in the past 12 months (50/100).

Bus factor

30% weight

27/100

Top contributor wrote 80% of the last 15 commits (past 12 months).
3 people authored those commits.

Responsiveness

25% weight

93/100

97% of all issues are closed (50 open, 1638 closed) (100/100).
21 of 24 recent issues got a reply or were closed (88/100).

License

Free to use

MIT · Open source (permissive)

What you need to do

Use, change, host and sell it for any purpose, commercial included, with no license to buy. Keep the copyright notice.

MIT License · Open source (permissive). OSI-approved license with few conditions beyond keeping the copyright notice.

Detected by GitHub as MIT.

GitHub activity

Stars: 17k
Forks: 1.3k
Commits, 12 mo: 18; last 9 days ago
Releases, 12 mo: 3; last 4 months ago
Contributors: 46; 3 in last 15 commits
Open issues: 50; 1.6k closed

Snapshot from 2026-10-08

Top contributors

Points for pull requests merged into Postal and reviews of them since 10 October 2025. Building something another user asked for earns more.

Flat Rate Deploy$39/mo